Improvement in ore-crushers



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MILES B. DODGE-OF BROOKLYN, NEW YORK.

Letters Patent No. 90,510, (lated May 25, 1869.

IMPROVEMENT IN ORE-CRUSHERS.

The Schedule referred to in these Letters Patent and making part of 'chesame To all whom it ma/y concern.-

Be itV known that I, MILES B. Dones, of Brooklyn, in the county ofKings, and State of New York, have invented a new and improved Apparatusfor Crushing Minera-ls, Orcs, and Rocks; and I do herebyY declare thefollowing to he a full, clear, and exactdescription thereof, which willenable those skilled in the art to make and use the same, referencebeing had to the accompanying drawing, forming part of thisspecification, in which drawing- Figure l represents a transversesection of this invention.

Figure 2 is a sectional plan thereof.

Similar letters indicate corresponding parts.

This invent-ion relates to a roller-crusher in which the ordinarychilled cast-iron or steel rollers are replaced by wrought-iron rollers,or by cast-iron rollers faced with wrought-iron, whereby the mostserious disadvantages attending said ordinary rollers are obviated, anda-crusher is produced, the rollers of which will draw in the quartz orother material to be crushed, instead of squeezing it back; andfurthermore, the crushing-suriaces of said rollers are not liable tobecome rugged by the action of the quartz or other hard materialspassing through between them, whereas the surfaces of the rollers, asusually made, of chilled castiron or steel, soon become rugged anduneven, since extra hard pieces of the quartz or other' rock to becrushed are liable to carry off small chips of the hard rollers, whichis not the case `with the rollers made of or faced with wrought-iron.

My crushing-apparatus does not vdiffer in form or shape from an ordinaryroller-Crusher.

It is composed of two rollers, A A, which have their bearings in astrong frame, B, the bearings of one of the rollers being made adjustablc, so that the distance between the crushing-surfaces can be adjusted to suit circumstances.

Usually the crushing-rollers are made of chilled castiron, and sometimesof steel, and if a piece of quartz or other hard material is placed uponsuch a roller, it is liable to slip thereon, and in many cases it isrery dificult to cause such a hard piece to enter between thecrushingssurfaees. Vth my rollers, made of or laced with wrought-iron,this-diliiculty is obviated.

l f a hard piece of quartz is placed on them, they, being provided witha comparatively soft and yielding surface, catch hold of said piece, anddraw it in without permitting it to slip, and while passing throughbetween the crushing-surfaces, the operation of crushing is effected.

Furthermore, if the crushing-rollers are made of chilled cast-iron or"`other very hard material, and a very hard piece of quartz, or a chisel,or other hard substance, passes through between them, it happens manytimes, that pieces of the crushing-surfaces become rugged and uneven;but if the rollers are made of or faced with wrought-iron, and a veryhard piece of quartz, or a chisel, or other hard substance, is made topass through between them, the iron of the rollers yields, and ispressed on one side, leaving a depression at one, and a protuberance atthe adjoining place, and by anot-hler piece passing through the rollers,perhaps the protnberance formed is pressed back again, and the evennessof the rollers is restored.

1n short, the advantages of my rollers, made of or facedwith,wrought-iron, over the ordinary chilled castiron or steel rollers,are, iu many respects, the same as the advantages of my wrought-ironcrushingfaces, in Crushers for which a patent was granted ,to me,December 4, 1866, numbered (50,154.

Having thus described my invention,

What I claim as new, and desire to secure by Letters Patent, is

The application of soft wrought-iron faces to the rollers of aquartz-Crusher, as and for the purpose herein set forth'.

This specification signed by me, this 25th day of March, 1869.

MILES B. DODGE.

Witnesses:

D. B. CHILDS, ERNEST F. KAsTENHUBnR.

